Hauptseite > Publikationsdatenbank > First Measurement of the Quadrupole Moment of the $2_{1}^{+}$ State in $^{110}Sn $ > print

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024 7 _ |a 10.1103/7ysn-8y1w
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024 7 _ |a 1092-0145
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024 7 _ |a 10.15120/GSI-2026-00246
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024 7 _ |a pmid:41385675
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037 _ _ |a GSI-2026-00246
082 _ _ |a 530
100 1 _ |a Cederkall, J.
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245 _ _ |a First Measurement of the Quadrupole Moment of the $2_{1}^{+}$ State in $^{110}Sn $
260 _ _ |a College Park, Md.
|c 2025
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336 7 _ |a article
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500 _ _ |a Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license.
520 _ _ |a The Sn isotopic chain, exhibiting double shell closures at 100 Sn and 132 Sn , is a key testing ground for theoretical models of the atomic nucleus. It was originally predicted that the transitional matrix elements between the first 2+ state and the 0+ ground state for the even-even isotopes in this chain should show a simple dependence on the neutron number. This prediction was, however, disproven experimentally in some of the first experiments with postaccelerated radioactive beams, a situation that has remained unresolved ever since. Subsequent theoretical work has suggested that the explanation can be found in proton excitations across the 𝑍 =50 shell gap, with an accompanying experimental signature that the first excited 2+ state in 110 Sn should have a distinct oblate shape. In this Letter, we present the first measurements of the spectroscopic quadrupole moment of the 2+1 state, 𝐵⁡(𝐸⁢2;4+1→2+1) and 𝐵⁡(𝐸⁢2;4+2→2+1) values for 110 Sn , as well as the 𝐵⁡(𝐸⁢2;2+1→0+1) value with significantly improved precision compared to previous results. From the same experiment, half-lives of the 2+1 and 4+1 states were measured using the Doppler shift attenuation method. Our combined result, 𝑄⁡(2+1)=20⁢(8)  efm2 for 110 Sn , is the largest positive value known among the Sn isotopes, indicating an oblate shape of the state by more than 2⁢𝜎. Comparison of the 𝐸⁢2 transition strengths and quadrupole moments with recent shell model calculations are presented.
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700 1 _ |a Fahlander, C.
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700 1 _ |a Golubev, P.
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700 1 _ |a Knyazev, A.
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700 1 _ |a Iwanicki, J.
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700 1 _ |a Wrzosek-Lipska, K.
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700 1 _ |a Blazhev, A.
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700 1 _ |a Reiter, P.
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700 1 _ |a Rosiak, D.
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700 1 _ |a Seidlitz, M.
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700 1 _ |a Warr, N.
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700 1 _ |a Butler, P. A.
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700 1 _ |a Gaffney, L. P.
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700 1 _ |a Berry, T.
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700 1 _ |a Cox, D. M.
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700 1 _ |a Pakarinen, J.
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700 1 _ |a Kröll, Th.
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700 1 _ |a Henrich, C.
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700 1 _ |a Schilling, M.
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700 1 _ |a Stahl, C.
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700 1 _ |a von Schmid, M.
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700 1 _ |a Rainovski, G.
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700 1 _ |a Gernhäuser, R.
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700 1 _ |a de Angelis, G.
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700 1 _ |a Borge, M. J. G.
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700 1 _ |a Tengblad, O.
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700 1 _ |a Otsuka, T.
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700 1 _ |a Tsunoda, Y.
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773 _ _ |a 10.1103/7ysn-8y1w
|g Vol. 135, no. 22, p. 222502
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